<!DOCTYPE html>
<html>
<body>
<table bgcolor="orange" border="1">
<tr>
  <td>c11</td><td>c12</td><td>c13</td><td>c14</td>
</tr>
 <tr>
  <td id="c21">c21</td><td colspan="0">X1</td>
 </tr>
</table>

<script>
document.body.offsetWidth;
c21 = document.getElementById("c21");
c21.parentNode.removeChild(c21);
</script>

</body>
</html>
